Ship s capstan



UNITED sTATEs PATENT orrrcn CHARLES E. MARWICK, OF PORTLAND, MAINE.

SHIPS CAPSTAN.

Specification of Letters Patent No. 18,053, dated August 25, 1857.

To aZZ 'wh-0m t may concern Be it known that I, CHARLES E. MAR- wrox, of Portland, in the county of Cumberland and State of Maine, have invented an Improvement in Capstans for Ships and other Vessels; and I do hereby declare that the same is fully described and represented in the following specification and the accompanying drawings, of which- Figure l, denotes an elevation of a capstan constructed with my improvement. Fig. 2, a vertical and central section of the Fig. 3, a horizontal section taken through its key ring. Fig. t, a top view of its barrel. Fig. 5, a top view of one of its capstan bars. Fig. 6, a horizontal section taken through its base B, and soas to exhibit the gearing in the lower chamber or part thereof.

In the said drawings, A, denotes the barrel of the capstan supported on a base B, in the usual way, the said base and barrel having a series of pawls, a, a, a and a pawl rack applied to them in the customary manner. The barrel, A, should be so connected to the base, B, as to rotate on a hollow shaft, (or its equivalent) extending from the ase.

In carrying out my invention, the upper end of the barrel, A, is provided with an annulus or lip, C, extending above the same and furnished with a series of recesses, CZ, CZ, d, the said part, C, being like a circular rack.

Resting on the upper end of the barrel, A, and applied to the same so as to turn freely on it and the recessed lip or rack, C, is a key ring, D, which consists of a frame or annulus constructed so as to have a series of radial holes or sockets, e, e, extending through it horizontally and for reception of the ends of the capstan bars, such as is shown in Fig. 5. Each of these holes, e,

has two bit recesses, f, and, g, extending from it as shown in the drawings, one of the bit recesses being arranged vertically and of a width to correspond with that of each recess, CZ, eZ, of the lip C. The other or recess, g, is of the same width, and is for the purpose of enabling the bit, Z, of the capstan bar (see Fig. 5) to pass through or into the key ring in order that such may be entered into one of a series of radial holes or sockets 71 h, It, formed in a head or cylindrical block E, which is arranged concentrically within the ring, D, and aflixed to i the upper end of a vertical'shaft, F, extending downward through the hollow shaft, a', on which the barrel, A, turns. On the lower end of the shaft, F, is a pinion gear, G, which by means of two transfer gears, H, I, communicates motion to a gear wheel, K, which is fixed upon the lower end of a shorter and second shaft L, that is supported and rotates within the base B, and carries a pinion gear, M, which engages with a gear, N, fixed to the lower part of the barrel A.

The pinion, M, should be so applied to the shaft, L, as to be capable of either freely rotating thereon or of being fastened to it by means of a small key, 7c, which may be inserted between the pinion and its shaft so as to project a short distance into each. Each capstan bar is provided with a projection or bit, Z, arranged on a ferrule, m, fixed on the capstan bar, provided such bar be made of wood.

Vhen the capstan bar is inserted within one of the holes, e, of the key ring, D, and so that its bit, Z, may be forced through the bit recess, f, of the said hole and into one of the recesses d, of the lever, O, the ring, D, will be locked to the capstan barrel, A, so as to enable the same to be put in rotation.

In case it may be desirable to augment the power or purchase for rotating the barrel each capstan bar is to be inserted in its hole in such manner that its bit, Z, may pass into the recess, g, sufficiently to enable the capstan bar to enter one of the sockets or radial holes, it, ZZ, &c. of the head, E. This having been accomplished, the key ring, D, will be locked to the head, E, and may be turned freely on and independently rof the capstan barrel A and thus as the shaft, F, will be rotated with the head, E, the rotary mo* tion of the capstan barrel will be effected by means of the gearing hereinbefore described.

In case either of the gears-Gr, H, I, K, should become disarranged or broken the key, 7c, may be removed from between the pinion, M, and its shaft L, so as to permit the pinion to rotate freely on the shaft, such rotation being produced by the gear N, when the capstan barrel is in revolution.

From the above it will be seen that I have produced a very simple and efficient means, by which the capstan barrel may be put in movement either by a series of multiplying constructed, arranged together and applied to the oapstan barrel A, and the driving shaft, F, of the multiplying gearing and 15 operated by means substantially as hereinbefore specified.

In testimony whereof I have hereunto set iny signature this 26th day of June 1857.

CHAS. E. MARWICK.

Witnesses:

R. H. EDDY, F. P. HALE, Jr. 

